Improvement in devices for grinding the flat faces of valve-seats



duiirli iait atari dita-r,-

SAMUEL J, PEET AND DANIEL SAWYER, OF BOSTON, MASSACHUSETTS. ASSIGNORS TO SAMUEL .T. PEET.

Letters Patent No. 111,966, dated February 21, ,1871; antedated February 11, 1871.

IMPROVEMENT IN DEVICES FOR GRINDING THE FLA'I' FACES OF-VALVE-SEATS.

The Schedule referred to in these Letters ?atent 'and making part of the same.

To all persons to whom these presents may come:

accompanying drawing, of which- Figure 1 denotes a side elevation, and Figure 2 an end elevation oi'vour said invention.

Figure 3 is a vertical and central section ot' the same as applied to the body or shell oi' a valve, and

in position to grind the seats thereof.

Figure 4 is an inside view oi' lone of Vthe disks or plates, to be hereinafter described.

Our invention has reference to the reduction of that class of valve-seats whose faces are flat surfaces, and isespecially designed for grinding or planing the seats of the valve for which Letters Patent were granted to one of the undersigned (via, SAMUEL 5. PEET,) on

the 1st day of January, A. D. 1867` and Our invention consists in the combination of two steel disks 'or plates, each of whose outer ends is provided with a series of cutting-ribs or serrated cuttingsurface, with a conical wedge and screw, in such manner that, when introduced between the valve-seats to be ground or reduced, the said disks'or cutting-snrfaces thereofcan not only be readily adjusted or brought to bear with the desired force against the faces of such seats, but be so moved as to quickly reduce or griml them, and this with great facility and ease. In the said drawing- A A represent two circular steel plates or disks, on whose outer ends or surfaces is formed a series of ribs or cutters, a ,extending inward from their periphcriesV and entirely around the saine.

"Each ofthe said disks has formed on its inner side a semilcyliudrieal groove, l), which terminates in a semi-conical cavity, c, each of the semi-grooves hav-y ing a semi-screw thread cut in it, as seen in g. 4.

The said two portions, when brought together', are to receive the conical Wedge (l and the screw e, formed on the rod B.

l'lhe upper end ofthe said rod or spindle is provided with a hand-bal', C, for operating the screw and wedge, as well as the grinder or disks A A.

' Eurtherniore, each ofthe said disks ,or plates has a a curved or crescent-shaped recess, f, made in its lower edge, the same being to receive and fit upon a correspodingly-shaped central bearing or curved project-ion, formed on the bottom of the valve-cavity of the shellwhose seats are to be. ground.

In,operating with our said device or grinder, the

same is to be placed within the valve-chamber ot' the body or shell of thc valve whose seats are to be ground,l

and pressed downward until the disks A A rest upon the bottom of such chamber. Next, by rotating the rod B the actionoi' its screw and wedge willcause the disks or plates to be moved outward in parallelism, and their cutting-faces be brought to bear equably upon the valve-seats, and with any desired degree of force. After having been thusadjusted, we have simply to rock the said disks, or give to them short segmental motions upon their axes, by means of the hand-bar C, in order to grind the said seats smooth and parallel. I

Our invention is not only simple in construction and effective in operation, but is productive -of a great saving in time and. expense, especially in regrinding the seats of valves that have become nnevenly worn and leak, as such have not to be removed from their connections and taken to a repair shop, as hitherto required, but can be `readily ground without removal VAJting-surfaces, as described, in combination with the rod B, provided with the conical wedge (l and the screw e, arran ged and operating together substantially as and for the purpose set forth.

` SAMUEL J. PEET.

DANIEL SAWYER.

Witnesses F. l?. HALE, O. WEBSTER. 

